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McCoy Farm near Adna: Carnelian & Petrified Wood Rockhounding in Lewis County, Washington

Updated June 2026

McCoy Farm near Adna is a mapped rockhounding spot in Lewis County, Washington. Reported finds include carnelian, petrified wood. Below: coordinates, access notes, nearby spots, and trip-planning links.

Map showing McCoy Farm near Adna in Lewis County, Washington

Quick details

Access
Public area
Nearest road
Ceres Hill Road
Postcode
98532

Geology at McCoy Farm near Adna

This spot sits on Wilkes Formation, mapped as continental sedimentary deposits or rocks that formed roughly 23 to 5 million years ago. Sedimentary beds like these are the typical host for petrified and silicified wood, which weathers out as durable float on slopes and in washes.

Mapped unit
Wilkes Formation
Age
23–5 Ma (Miocene)
Rock types
continental sedimentary deposits or rocks
Elevation
630 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit McCoy Farm near Adna

Best months: January to November. Typical highs run 76°F in midsummer and 45°F in midwinter, with winter lows near 33°F.

Climate normals: NOAA 1991-2020 monthlies, CENTRALIA station (11 mi away), adjusted for elevation.

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

State guidance last verified:

Found at McCoy Farm near Adna

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of McCoy Farm near Adna.

Across the state line from McCoy Farm near Adna

McCoy Farm near Adna is close enough to the Washington border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

McCoy Farm near Adna FAQ

Where is McCoy Farm near Adna?+
McCoy Farm near Adna is in Lewis County, Washington, at 46.61713, -123.14135. Nearest road: Ceres Hill Road.
What rocks and minerals can you find at McCoy Farm near Adna?+
McCoy Farm near Adna is reported to produce Carnelian, Petrified Wood.
Is collecting allowed at McCoy Farm near Adna?+
Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.
What tools should I bring to McCoy Farm near Adna?+
A rock hammer, sturdy gloves, and a padded bag cover petrified wood hunting. Most pieces are surface float, so walking slopes and washes beats digging.
When is the best time to visit McCoy Farm near Adna?+
The most comfortable months at McCoy Farm near Adna are January to November.
How do I get to McCoy Farm near Adna?+
Open the directions link to navigate to 46.61713, -123.14135 in Google Maps. The nearest road is Ceres Hill Road.

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